Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba895207fc29c699…

MALICIOUS

PDF

87.8 KB Created: 2021-09-24 05:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d71caf7d5349f4f0df813a87685c7885 SHA-1: 125f0c7dac37d3f07e91b1e95c1700d988669c44 SHA-256: ba895207fc29c69946b777d859196d1f1388a07d0a9cc1951320cc099513ff5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to various disposable hosting sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ww150007.linebot.net/upfile/files/20210921204914.pdf In PDF document text
    • http://carmakers.cz/userfiles/files/4371713705.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210912191144.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/8703528202.pdfIn PDF document text
    • http://csp.hu/editor_up/wilezodexemobopaxobakase.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/38939586661.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/tisixegurawujovaximof.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/sopodereresudabililetep.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/rejelojofujivujajo.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/gijexuginawasanovopa.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/53043667295.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/66747455584.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4859b30de---kujotoxisifasizowojor.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/24730582985.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/fapimulexekukezadudo.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92230894025.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/vowarifemaka.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/mivozir.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/39158547199.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/mewesuzexafuduwapofafo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/morigetupoxetitututilu.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/63896013191.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/jenetuwuvobababego.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/xevalij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=zookeeper+simulator+game+download+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 17788 bytes
SHA-256: 282c736583d7b19356010f70587d89d86a37af54c1b159addc477fd99c4bb2b4
font_01_sfnt_off00011f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001373e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 11084 bytes
SHA-256: 3c33b4de9de74eb09a30a6caf90b9418bbb4ab01b32a34776e5d73e092c320bf